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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b9bd5ae0480e819990455c2d57b52d9b1e9d936d2110391829fb7f0ba44700' 
  AND token = 'hwb87UMLPd1EHqLX4icoqAxrRUCqwP/DF9JlZ2SPsZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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