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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc92b220b9944550bffc1c1d99b9fabc0b70c37f61183a41613db5630e9f303' 
  AND token = 't6/FM4JozHB1PG+gkstIlWV+N2C2kXye34B9fJkPqwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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