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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df344c6fd09cc3255e98dbe600b528a9b1110e30a6e7b1c574000a71e819bd2e' 
  AND token = '5i7Zte4ZFmF0arrd2ESjeyj7681kr0Yi4otDqciVUSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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