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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ab30a614360d2dcdb714bd09533b588ba730db77b2d02718dd17e984d6edb5' 
  AND token = '2/TCnR/0eWLXNQIsCqmvYOCBAA1TFNClgcwrNXZ8dr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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