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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f9a4032777cbad4f3eb3df49089bc2b5049d54b225fdce2b30097e6d8255fa' 
  AND token = 'VivQjgxb92uCGqmBGJvLWl2jveiLf7yhtBQqjs5ioS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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