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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a6371ec8b072ddc1256b42fb96e6be213b8b52764cf4516d8e4daf34099897' 
  AND token = 'iI7HegaRT1bEJpQzLq5XJ+OnYxPz758SQwOj5leU3nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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