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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3d51677fad3780a7bcb661a0ce0526a92860cf84306f493d6f2b384f62629d' 
  AND token = 'MYUpHwHVXzk7az/RmG2PdNzWMMxQpWqTb0KZVRX5feI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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