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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f763b225d1931fcbfd92d43e115cf49f87ccc774bad868210f14e0ce86a19181' 
  AND token = 'rNnz9ed+UtimJKwPDIUe+Pvez3AlnLKJ+v9iQr/aIuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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