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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440a34cac9b5d0be8f726c1862c9ec6e244ad2b6accce49f18625a6071494fe3' 
  AND token = 'LXWytMRfvUOxfF1nKokcTBYgXAV9p4umuPXPR3I8Hvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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