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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1befe5368b9ec8d8e85daee2c9a938d834b0f163f8eef8fefff2a992e6d13fac' 
  AND token = '1oz8LSSsppXW9z6IGPEgOd6qw4OBt8o8WJV6Aar9q/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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