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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c789ba44f086f8c709c5f69a3dde2604dc9dca87485177e0034d86de4a7c20' 
  AND token = 'eHX6p7Xmz+SA2TGX3bJ8q6cXb0i7DXOp/XJkM3UgsE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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