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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5deea9253d6dffaa07f72256e6f8da3793a13876bd490d96cb408547c12469e6' 
  AND token = 'oebfdcRCBhrWEFjkFsooHT6eaxy6rzeOQYj9k6Jj7hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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