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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa529ae1bde3ed9738246fd294fd28da03d596ed725bed540f55c142501ff6f7' 
  AND token = 'ANK+kAssTl2HldX7ZN5GRHvY2iORbS5x2Ty9g4Obcmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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