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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2ee5ff37426fbf63234be891a06ac679e54657f0beb032063178a92042c047' 
  AND token = 'iDrXV1QDI8WhXz6uHoYiVN7QzYYvIeRviR88l3af2I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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