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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1af7d7a0e5795628a18b1a5c6417a7830765d7fc3b82b7e9bda91661484691c' 
  AND token = 'tT7FIlwJMy3NFTD//V1A6JDJT0ft8gBtOWxfi4kSfAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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