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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a5ea83f6271e8a52608d4b155d2e1917d97a4ec1b16581a330cdeedf19e391f' 
  AND token = 'AIxtIoboexI75ms8JvYfhsoDuCCT2k9BE00iVjS6mMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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