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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32c1fc215818a4a32f38aafd96491ab0e34a659fed0164bab8c46a2045cc799' 
  AND token = '3JiqMVX45O1oNjYYUTqocz6n0irsTjudainv++q+w2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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