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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab78d715fbff9e9ba648403ebbab46ec5e27df68e5abe65b774cf7137fea646d' 
  AND token = 'to2Iwiq01kCNhyYI8jiSiElyArKXTaYalyq89bZwAvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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