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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b30764faba402c26c0dc32602f3063563437347111f7098786b84f27eb35d0b' 
  AND token = 'hiVdMJ1vaGJTSKy5o6j3qNE7+b5IHDY9zJqNULt8SYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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