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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e209199b241523cfdcf4d8a3ea726d7cb187b4dba1f4f13c8289c3a1f5b42e3' 
  AND token = 'oo20EAS2p8l9ETelS6iBS8mD7NVcFPMDgScGkXG0iB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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