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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173c010eade0d605210342263c382568df0ffe3f95ce27ad0a156e78bea8859d' 
  AND token = '/roekw3dFzWvlbZkzFuDzS2QcoElzG11mTn9KtmECqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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