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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042556b8a6f4f8d62edbc59d1f1358e4091e47e538e1d8fef090ab0c31fc1c84' 
  AND token = 'uxG3CitMXi1d1n45TI2wn2N8T8xJHBYFxLte/r/dCBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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