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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d78f88cadaae37fa6ad373a3e3e84fe002e129edd3eeabb69e2858ce71108d' 
  AND token = '3w9gEs8Zjx7ZT3cPtBM/j0HSJlxmqKJgg5WFRpgg5ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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