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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48131e0d0f44b1d374e1e40637369fac1d8054a84d81b68f96bdaa42630e57fb' 
  AND token = 'y5EDAsFmi7JDS8BKyH+5/l/Ee7eRl1mJ2o4qG9h3mig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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