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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5e43958c59b32603ec16e65826c7a683061656baaca0373af4026b603b5f7f' 
  AND token = 'AZV1AGkfWfzIXJDJmkFx3yuMmurrwri6XfMFtmI9or0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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