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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f6b77d857aa33586bc5421e88f462e39c2ea7e5f036de61c6cc23350ef246c' 
  AND token = 'I/sCSp6yiZBgeTFsv0Zf8zSYRBhbedalRzw4S/br36s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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