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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfeb768f1a4e17db9d1c74db38824189cb2d67cbb58e3f8f8ec363a9db71f75' 
  AND token = 'kt2Y/zyJ2ps3TGsvH79s/Q5LWlfhG7+Ma+r6CeS73l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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