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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ff99c49cfd12f39acd43fffdf257686b905f26f862d5b7b96d58bf1bff7195' 
  AND token = 'QWh93cK2WoKzeLrvTqDDNq12jn65SxPs8oVDnYPxTMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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