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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30fad1fe29b3e8636d53a7599f3425a79335a682f841e6b6ff5f8ac41de83d11' 
  AND token = 'p39LNAokMEMEVNeQZpS0GJ1dpCDFhxZmzvAaE78/1tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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