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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36520796dd6592797359afe7a693d7f6208ca677fec7b015ccad0a659637d77a' 
  AND token = 'SHj52KFDE+TKQy3eXgqiXwzY+zODcEpQJ9sYw7opX8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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