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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b569150805027e4107d840b5b5cf0a747ba7e675507722ee88bd154a9eac85b' 
  AND token = 'HkZRp0WBunrlzmCS5b7+s1RfrXl1/mTTEfksFbrFWVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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