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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77d34a6ad4264422bc4b71c82955dfe8dba29ddc61673382c1adc607ac851e5' 
  AND token = 'oJ1c2qSVLSqb1YUP+n0Kiv6cB7LqaklKykDM+6HrbeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}