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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33dc53a0c824144b03ff3c6868c14d3e1bb413a54281df16bbe74406ec14a807' 
  AND token = '8rdoXk0JUGTv7gq56dYV1EEK6Rve2kS9NIoZsRt/PHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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