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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b38302ba6ef6e3f0a05ef1da0688e017f1303c13be5a2947fba18893eec35e9' 
  AND token = 'HeI8t73SN/iqJxSxroG6jUkUzR9CXHFaurQ10CspGpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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