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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618bef3f64967403c8348598ac4ddfc40865ba087c5fec490c45dfe1e2c2ee39' 
  AND token = 'pCOafwRG6ceb2b4DOOGrAXHwXifUCumBEDTNBFGdBRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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