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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8b18811d94e1857429ed7b176aff75b0974b6941d028a864f8cc8853db5c57' 
  AND token = 'X/Jt0yV+4ijnlFWtWUNfwJkPbvdi5mAYeU0hgxP88bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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