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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33fdfe0e9eef9854924b47d45741aea39b160106e8b9088490d9950a5beeac35' 
  AND token = 'IjdO0i0pJ9YcgXgI4VYUnvfoUqZAkWQ7rkjPlV9snH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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