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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff58b124ae6efde548f0f57e53270735500166f0ee00d86385a3d60a9edda3b' 
  AND token = 'gJ56wz8mCD8pbKKBtKhcLcnvXQvv99fa5Cmk9DzLx4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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