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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e144b94f21ccce3c968f760cb0101836b60f9661d5dae185b32c763e7ce342' 
  AND token = 'bp96Ekdu3kB6jF1F5GluEyamoGe9oSvH43dlfo5PhQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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