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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf5a01efec9bc2ed3af4b2d88aeab44a2352ec1974810afad9ea647b5acc871' 
  AND token = 'd0huGjDAujtfN4qouvkkDrhiKogu90H3MIwscTV3H20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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