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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32a31cda5c412242309d6781483afecc0546652449f062b3b05a60fb6dc6754' 
  AND token = 'EG/gvlBUEEsxgPktWQfIOMfDe8GsQrS6uuUboxD9zb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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