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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d5b0c7ce204428989ccbd1c8e6eaf03000a4e15e77265af9dcca5cee5af3ba' 
  AND token = 'BEdvOdjMHzHrGVicX6H1M3T8lyJ4fgxhfGs7/IoEu7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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