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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb909333982bbebb64e01227fa525e5f3c43ccea28fb970a5b9a8ae386ef9378' 
  AND token = '+dhFtZLzkBr5YVp/gqITT+W0Y+mSMfq754Dg52EhneM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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