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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6eec182de313c5af1aa436f24dc92eadb45bb6e2a410c4d7c6d4ec3d6edc66' 
  AND token = 'Ix8KLn+R3reEfan5whYXOCTDqF3XllEH6xrFtEZIZPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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