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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5498eacf0808a93ce6e8e72e70dcb8fa117781e8bcbe6621113c5a368341f78c' 
  AND token = '73Uq9G8DdJ3fHrl2kyUSSL7Wc/yEGbHZbTJYPNMhqgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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