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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efffd0a49c4ad0d2006db547349f62b5e403865e5edc82d68372383e01e4e738' 
  AND token = '2YHYCkUcMx2MBhxQZIajVeTR14ytrz19BPwD9lvREIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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