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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c5bc7767c36f748c9017645270d8bd33313b4e3cc6f2aa682b8fbba124ff7e' 
  AND token = 'owTE5KtauGs2vfkSOMs+kxMOr4h0aC3k0NMM5wUUPlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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