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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f807556d3e338431dd91bd96a9ab9b92c557538c3d1ef77a05f11f376d218ba' 
  AND token = 'I9tuLWn5CX2MOEkRiL5mon7MkhFedWNqJcwA5oN54QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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