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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d1e17c3c7fd317b55a2c4aa6cd7335c60dd922539da299445b4e9622e4cfeb' 
  AND token = '+pRFXrtmiXa+DkX2xTrqmIxBAIRbiAQn69tmCO5FDhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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