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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf67b1bd1b387806ba875490344cd206532287d43c6d7c4e5564c7f06561ea99' 
  AND token = 'JuNiO5N7e1SV+Kk5ta6Wfiby7u1ZoXccSrNn1my7EEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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