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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1199b59c229c00c095114bc37ff5da2a583376f3c0f2477504b851bcefa5746a' 
  AND token = '+iHvy8cf3NyBWmVt1IozKnS7bWyYV/yqd5stTX8PyQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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