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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156153acf3850c2aa5206ceb5cb7a7f5b214e46e3a778e8145ddbf1af9ee2ded' 
  AND token = '3qicTQc5q06iBVfj6Y+YJUfJmlW38LQqy/sFZRD6NA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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