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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118209b2cf367c3bb6fd00d53e450ed5c60260d1c8d096ebd2920e634452acd2' 
  AND token = 'd/ADxeSsY9QGYI5GUVAgDqNH+3DDRv5CPVOra4YEGDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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