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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ac7dd0764fbefd38eabb4db6fa4d13038e4894d4917451f8c2ee14c1a2a725' 
  AND token = 'sQPYB8DVCo25wdXlaQ2CEVsJXKNGJ07f0KGdKdSZHho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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