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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063173067befcc4b3f08334ccd4b951aaf80973f948fa33274496fb646778d47' 
  AND token = 'RBI1FGm29Oi8s5gpVIj3g786ZyXmmu5qcqMDalS1RxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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