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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8939f86f85550b440d6f4928e0b1b32f74da42c9c0fea2d8ee144759ffbfe3' 
  AND token = 'A1QN13crfPW4QeSgPrt3ySBTwtas1lEGJJC0iKlmvrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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