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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45abba93b4a196b1e382bd8ba3155cbd0f36b8cc9bfd67e43c1e655e38655ad3' 
  AND token = 'J1T1plkS/k5a6GIguQ9UGiek7M2jvMNOtPr+K6WCCY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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