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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5859c43aeed892756f53f39220f6a987329c652c8ff8a12fd873fa7630e08872' 
  AND token = '+TonZDUoEQegRmoXoUJewH8glAVOpv0G6m9Qw980Lh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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