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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444c62d5cfcb388a43111f0537c0699e919fc601397edcac4f5f339f668886ca' 
  AND token = 'cZLiIaJCRZyAefm6FTz7Q88K7W7nE51b2iNS2G7B6/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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