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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09303075f52da502593f7d5bd937b286ea21519d855ad9fcf2e01631f3ca09d' 
  AND token = 'dbiZA93cXRK1lmjrkKNBUz8uxDooBgE7x9p7DSWPEXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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