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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf781201ef9949d91e63ad314006f4cdbd09a6f0f36a2da06ebd1f711feefd7' 
  AND token = 'dZMiOsdfgN9xBJLsvyJeyOxmqxz9bl4lttCM+yo8d0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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