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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13cab0d5aef097e46312add5239ee0c9beb0ab69cc4df9555414044a28d0b4f' 
  AND token = 'ewdktnqbc0HRIkcYte7azI4L9bZoeLN3YbOS95SanxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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