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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19f0b3dbec96745ea7b215a6aa1f7e7b7944dd4338e56fa9d85b6466d61d667' 
  AND token = 'wC23gl0QVdi5QVvI70wQPk85rTRc+1LYjuME9P48+zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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