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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba2f04b8d7824ae28674b991962d79810a68423c3a84aa8c72c7b9eda54e0d9' 
  AND token = 'jz8L6e7yeF+jtjo3lhitXaFOYvN2CVnGD99xJq7JZaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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