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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0388260cf0c807e94b50500287f220d5baeb5a10d8a7286552b23ab8f78b40d' 
  AND token = '/56AD7tQ42W14HJJ0EcJIZUCm+oh3IrN2k0L0T3ta8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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