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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36bdb4a77cc8076bd15a6687d917824f7cee6fc7289711276a80564d19cd2ee' 
  AND token = 'hcaC6eh4c4XzQWYlXJGMs+ckdQBDj7+uNLyeIs0/ANc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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