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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1ff334e2b545dfe627a9732349e51015f01d89b6fe58374ffbb346a606df87' 
  AND token = '4TZ1L4nDImMLURFiJuAMGd2891+blDTIeVINsPRQwts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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