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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86f7b60eb476948e15fb22a87fd4bd619d2e9b8f995b7170a82571f3ab04b5f' 
  AND token = 'aeL/+bq3f0B30HFswKjf40ll5IQn8nheHvqlf1TEFbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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