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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd050e35807df97c05b39b199d5fc1d981e9ffad1ca3028d0d0fdb07b244555' 
  AND token = 'MeOG9eKzKcnPs9YiDulvjyKRRwg7PS16Nw22KLDQF/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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