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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9715054b34b421887df78d84e1b2add9ac024292ef56927bab6a2d6379162a73' 
  AND token = '9hnU+B2WLG098t849qCj4xqf6B7moCMXdhJ08+7HqQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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