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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd321f3ba2efeb1b1b3186a1c661ba4f455e77d843f6ce33c61b7bbb46acebae2' 
  AND token = 'u6YFFa1U39hLKUBtXU8PQyS5AuhV5/onFW/3xZgNeFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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