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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52995587da4df7f3e2395a1d4c0801c33514b2a34c3bbd71afb4b9db769d8575' 
  AND token = 'yeatvUQNmDg6es00aq6Fc0ly+sy6UFzR9DxwUevRuDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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