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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f248f3f6eacc875cfe4efe08d5df46b9cce95808be13b46dac0ae13a90a60d' 
  AND token = 'SbtXHiN2o5wALV+PhFY+nmTPEtRbaGdffB3WIswE+DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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