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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e5c31ddf7bc136bf9c0924a8eecdb8fbf95e0de7f330ea5253c6635fb7d11e' 
  AND token = 'tuzwru+R3MA3old4P+CsdR0nI0JB2g2nljuN9Fd7NAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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