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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60fc912a73e1728c780ea5b9ea8169b7d0025ac8b2636c17ef8a4657689701b5' 
  AND token = 'IshE+G7a28YaIQg6EvvRqZP3dntuTOCgFDeVAav9m28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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